Device for charging blast-furnaces.



No. 730,922. PATENTED JUNE 16, 1903.

M. W. JOHNSON, JR-

DEVICE FOR CHARGING BLAST FURNACES.

APPLIOATION nun JAN. 1a. 1903.

10 MODEL. 3 SHEETS-SHEET 1.

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' PATENTED JUNE 16, 1903.

M. W. JOHNSON, JR.

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UNITED STATES V Patented June 16, 1903.

PATENT OFFICE.

DEVICTE FOR' CHARGING BLAST-FURNACES.

. SPECIFICATION forming part of Letters Patent No. 730,922, dated June 16, 1903.

Application filed January 16,1903. Serial No. 139,259. (No model.)

To all whom it may concern.-

Be it known that I,.MARK W. JOHNSON, Jr. a citizen of theUnited States, residing at Birmin gham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in-Devices for Charging Blast-Furnaces, of which the following is a specification.

My invention relates to devices for charging blast-furnaces.

The object of my invention is to provide between a scalecar carrying the material from the source of supply and a skip to elevate it to the furnace an intermediate vessel,-

thus permitting the car to discharge its load independently of the position of theskip and the skip to receive its load independently of the position of the scale-car, and when two skips balancing each other areused, one being up when the other is down, a further object is to provide such intermediate vessel for each skip adapted simultaneously to reeeive the load discharged from the car. I

A further object is-to provide devices, including an automatic trip, to discharge the load from the intermediate vessel into the skip when the skip is in position to receive the load.

WVith these and other objects in view, as will more fullyappear, my invention consists of the constructions and'combinations hereinafter described, and set forth in the claims.

In the accompanying drawings, which form a part of this specification, Figure 1 is a plan view of scale-car track and hoppers. Fig. 2 is a front elevation of same. Fig. 3 is a side elevation in section through the line A B of Fig. 2 and also shows the skip in position to receive the load. Fig. 4 is an assembled view showing the scale-car," hopper, skip, pit, and bufier for skip, also the automatic tripping devices and the emergency hand tripping connection, thehopper being shown in section on the line A B of Fig. 2. Fig. 5 is a detail of the releasing-pawl. Fig. 6 is a detail of attachment to skip for operating the automatic trip, and Fig. 7 is a detail showing the automatic trip.

Like parts are represented by similar numerals in the several views.

In the drawings I have represented the inpers simultaneously. I-further provide the hoppers with suitable discharging devices, including an automatic trip and an emergency-lever, which I will now describe.

A trap-door 2 swings upon a shaft 3, held by hinge-straps 4, andis provided with a lever 5, having a counterweight 6 slidingly mounted thereon. The weight can be adjusted to the desired position and tightened on the lever by set-screws 7. The door 2 fits within the sides of a chute 13 and when open rests against guards 14c and forms the bottom of the chute, of which a plate 15 is a continuation from the edge of the door to the point of discharge into the skip. When closed, the door strikes a jamb 20 and is engaged beneath by a latch-pawl 8, which looks it in its closed position. The latching device consists of a shaft-9, journaled in a hanger 10, carrying a lever 12, and the pawl 8. The pawl is keyed to the shaft; but the keyway in the pawl is cut away at c beneath the key, as shown in Fig. 5, so that the pawl may move out when the door is closed without moving the shaft. Levers 12 and 35 are keyed to the shaft 9 for the operation of said pawls, as hereinafter described.

The skip travels upon an inclined track 20, which is supported by cross-ties 21, resting upon a wall 37, and lands against a buffer 22. The automatic tripping device consists of a shaft 2 1, journaled in boxes 23, attached to one of the cross-ties 21, levers 25, 30, and 36 being fixed to said shaft, the lever 30 carrying a counterweight 29 to return the levers 25 and 36 to normal position.

A trigger-bar 31, carried upon the skip reach-beam 33-by. ahead 32, when the skip is landing in position to receive a load strikes the contacting plate 27 on the lever 25 and' rotates the shaft 24, causing the lever 36 through the pivoted link 34: to move the lever 35, and thereby release the pawl 8, allowing the trap-door to fall and discharge the load into the skip. The rising of the skip releases the lever 25, and the counterweight 29 through the connections described rotates the shafts 24: and 9 until the adj ustingscrew 26, Fig. 7, in the lever 25 strikes the plate 28, attached to a cross-tie 21, thus returning the connections to normal position, the pawl 8 lockin g the door in its closed posi-- tion. The trigger-bar 31 is preferably screwthreaded and provided with nuts bearing against each end of the head 32, as shown in Fig. 6, longitudinally to adjust said bar, and} the lever 25 has a set-screw 26 for adjusting; and defining its position, said screw bearing. against the plate 28 under the influence off the counterweight 29. The plates 27 and 28 are preferably made of hardened metal to} resist wear.

A hand-lever 18, attached to the lever 12 on the shaft 9, is provided to be used in casei of emergency when for any reason the auto-Y matic trip fails to operate. 5

The operation is as follows: The scale-Cari having arrived from the source of supply in g' position over the hopper, the load-is deliv-i ered to the hopper and the car is free to go I for another load for the same or some other furnace,'the intermediate vessel taking care I of the load until the skip lands in -,positionto receive it, thus affordinggreat facility in the f work. The arrangement is especially ad-3E vantageous when two skips are employed,forl the carcan deliver its load'to the intermedi-@ ate vessels or hoppers simultaneously, and; the skips alternately receiving theloads from the respective hoppers gives the car ample time in which to go about its work in supplying the same or other furnaces. 1

In Fig. 3 I have shown the trap-door in its. closed and in Fig. 4 in its open position. -It will be seen that the trigger-bar 31 and the Z1 screw 26 are adapted to be adjusted so as'to operate just as the skipis landing against} the buifer 22, thereby'releasing the pawl 'S, and the load, moving the trap-door into open;v position, drops into the skip. The rising of the skip permits the counterweight 29 tore-j turn the connections to normal position, which allows the pawl 8 to resume its looking position, and the counterweight't' oper-, ates to throw the trap-door into closedposi-E tion, the keyway in the pawl'being cut away"; at 0, allowing the door in closing to push out the pawl without turning the shaft and con-F1 nections, the pawl returning by gravity un-l derneath the door and locking same. it

Having thus described my invention, I? claim 1. The combination with a scale car to carry the load from the source of supply and; skipsto elevate said load to the furnace, ofgintermediate vessels adapted to divide and?v receive the load from said car and independ-f. ently deliver same to said skips.

2. The combination with a scalecar to? carry the load from the source of supply and.

skips to elevate said load to the furnace, of

intermediate vessels adapted to divide. and simultaneou sly receive the load from said car, and means automatically to discharge said vessels into said skips when the latter reach a predetermined position.

3. In a device such as described, the combination with a skip and a hopper having a swinging trap-door with means automatically to return it to closed position, of a latch to lock said door in, its closed position, and means automatically to move said latch to release said door by the movement of said skip.

4. In a device such as described, the combination with a hopper having a swinging trap-door operated bythe weight of the load, with means automatically to return 'it to closed position, of a latch consisting of a shafta'nd a pawl on said shaft adapted automatically to'e'ngagea'ndloc'k saiddoor'in its closed position withqutftu-rning said shaft, and means on said shaft'ada'pted to move said pawl and release the door.

5. In a'device such as described, the combination with a skip and a hopper having a swinging'trap doorand alat'c h to lock it in closed position, of a tripping device having connections to'said latch, and means'onsaid skip adapted to contact with'andmov'esaid tripping device and thereby release said 'l'atc'h.

6. In a device'such as described, the combination with a skip and a "liopperhaving a swinging trap-door and 'a latch tolo'ck it in closed'posit'ion, of a tripping device having connections to said latch, means on'said skip to contact with-and move said tripping device to release "said latch, and means automatically to return said tripping device and connections tonormal 'pos'iti'o'n. V

7. In a'device such as described, the combination with a skip and a hopper having a swinging trap-door operated by'the weight of the load, with means automatically t'o 'returnit to closedposition, and a'latchto lock it in closed 5 position of a station ary tripping device havingjconn'ections to said latch, means on said "skip-to contactwith and'move said tripping device toreleases'aidlatchand means automatically to return said tripping device and connections 'to normal position,

"said latch being adaptedtopassand engage said door independently of said tripping device and connections.

8. In amachine such "as described, the combination with a skip, a hopper having a door, and a'latch for said door,'of a tripping device having connections to said latch, means on said skip to contact with and move said tripping device to release said latch, sai'd'tripping device being adapted automatically'to return and having an adjustable part to adjust and liniit said return.

9. In a device such as described,the combination with a skip, ahopper having a selfclosing door and a latch for said door,of a tripping device having connections to said latch, an adjustable part on said skip to contact with and move said tripping device to release said latch.

10. In a device such as described, the combination with a skip, a hopper having a door and a latch for'said door, of a tripping device having connections to said latch, an adj ustable part on said skip to contact with and move said tripping device to release said latch, said tripping device being adapted auto- 10 matically to return and having a part to adjust and limit said return.

In testimony whereof I have hereunto set my hand this 10th day of January, A. D. 1903.

MARK W. JOHNSON, JR.

Witnesses:

WM. M. OoNNELLY, J. W. SHooK. 

